Sources and input mechanisms of hafnium and neodymium in surface waters of the Atlantic sector of the Southern Ocean

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Haley, Brian A. Jeandel, Catherine Pradoux, Catherine Deutsche Forschungsgemeinschaft (DFG) [FR1198/2, SPP 1158] This study was funded by a Grant of the Deutsche Forschungsgemeinschaft (DFG) to M. F. (Project FR1198/2) within the priority program "Antarctic Research" (SPP 1158). We thank Jutta Heinze and Ana Kolevica for lab support and the chief scientists Eberhard Fahrbach and Hein de Baar, as well as Captain Stefan Schwarze and the crew of Polarstern for their contribution and bravery. Many thanks to Celia Venchiarutti for her help during sample collection and preparation. This manuscript was significantly improved by the comments and suggestions by editor Sidney Hemming and reviewers. 7 PERGAMON-ELSEVIER SCIENCE LTD OXFORD GEOCHIM COSMOCHIM ACRadiogenic isotopes of hafnium (Hf) and neodymium (Nd) are powerful tracers for water mass transport and trace metal cycling in the present and past oceans. However, due to the scarcity of available data the processes governing their distribution are not well understood. Here we present the first combined dissolved Hf and Nd isotope and concentration data from surface waters of the Atlantic sector of the Southern Ocean. The samples were collected along the Zero Meridian, in the Weddell Sea and in the Drake Passage during RV Polarstern expeditions ANTXXIV/3 and ANTXXIII/3 in the frame of the International Polar Year (IPY) and the GEOTRACES program. The general distribution of Hf and Nd concentrations in the region is similar. However, at the northernmost station located 200 km southwest of Cape Town a pronounced increase of the Nd concentration is observed, whereas the Hf concentration is minimal, suggesting much less Hf than Nd is released by the weathering of the South African Archean cratonic rocks. From the southern part of the Subtropical Front (STF) to the Polar Front (PF) Hf and Nd show the lowest concentrations (